This document will be explaining predefined variables

$_SERVER['HTTP_USER_AGENT'] will get the user agent string of the clients browser.
$_SERVER['PHP_SELF'] will list the filename of the active script.

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Your browsers user agent string is: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

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The filename of the active script is: /infost440/a3/predefined.php